audio policy: fix build with USE_LEGACY_AUDIO_POLICY

Bug: 17894512.
Change-Id: I6431c0b03ba02cf561413c34848a334caa0261fa
diff --git a/services/audiopolicy/AudioPolicyClientImplLegacy.cpp b/services/audiopolicy/AudioPolicyClientImplLegacy.cpp
index 9639096..97719da 100644
--- a/services/audiopolicy/AudioPolicyClientImplLegacy.cpp
+++ b/services/audiopolicy/AudioPolicyClientImplLegacy.cpp
@@ -96,7 +96,7 @@
         *pFormat = config.format;
         *pChannelMask = config.channel_mask;
         if (offloadInfo != NULL) {
-            *offloadInfo = config.offload_info;
+            *((audio_offload_info_t *)offloadInfo) = config.offload_info;
         }
     }
     return output;